/* $OpenBSD: intrdefs.h,v 1.2 2004/06/13 21:49:16 niklas Exp $ */ /* $NetBSD: intrdefs.h,v 1.2 2003/05/04 22:01:56 fvdl Exp $ */ #ifndef _i386_INTRDEFS_H #define _i386_INTRDEFS_H /* * Intel APICs (advanced programmable interrupt controllers) have * bytesized priority registers where the upper nibble is the actual * interrupt priority level (a.k.a. IPL). Interrupt vectors are * closely tied to these levels as interrupts whose vectors' upper * nibble is lower than or equal to the current level are blocked. * Not all 256 possible vectors are available for interrupts in * APIC systems, only * * For systems where instead the older ICU (interrupt controlling * unit, a.k.a. PIC or 82C59) is used, the IPL is not directly useful, * since the interrupt blocking is handled via interrupt masks instead * of levels. However the IPL is easily used as an offset into arrays * of masks. */ #define IPLSHIFT 4 /* The upper nibble of vectors is the IPL. */ #define NIPL 16 /* Four bits of information gives as much. */ #define IPL(level) ((level) >> IPLSHIFT) /* Extract the IPL. */ /* XXX Maybe this IDTVECOFF definition should be elsewhere? */ #define IDTVECOFF 0x20 /* The lower 32 IDT vectors are reserved. */ /* * This macro is only defined for 0 <= x < 14, i.e. there are fourteen * distinct priority levels available for interrupts. */ #define MAKEIPL(priority) (IDTVECOFF + ((priority) << IPLSHIFT)) /* * Interrupt priority levels. * * XXX We are somewhat sloppy about what we mean by IPLs, sometimes * XXX we refer to the eight-bit value suitable for storing into APICs' * XXX priority registers, other times about the four-bit entity found * XXX in the former values' upper nibble, which can be used as offsets * XXX in various arrays of our implementation. We are hoping that * XXX the context will provide enough information to not make this * XXX sloppy naming a real problem. * * There are tty, network and disk drivers that use free() at interrupt * time, so imp > (tty | net | bio). * * Since run queues may be manipulated by both the statclock and tty, * network, and disk drivers, clock > imp. * * IPL_HIGH must block everything that can manipulate a run queue. * * XXX Ultimately we may need serial drivers to run at the absolute highest * XXX priority to avoid overruns, then we must make serial > high. * * The level numbers are picked to fit into APIC vector priorities. */ #define IPL_NONE 0 /* nothing */ #define IPL_SOFTCLOCK MAKEIPL(0) /* timeouts */ #define IPL_SOFTNET MAKEIPL(1) /* protocol stacks */ #define IPL_BIO MAKEIPL(2) /* block I/O */ #define IPL_NET MAKEIPL(3) /* network */ #define IPL_SOFTTTY MAKEIPL(4) /* delayed terminal handling */ #define IPL_TTY MAKEIPL(5) /* terminal */ #define IPL_VM MAKEIPL(6) /* memory allocation */ #define IPL_IMP IPL_VM /* XXX - should not be here. */ #define IPL_AUDIO MAKEIPL(7) /* audio */ #define IPL_CLOCK MAKEIPL(8) /* clock */ #define IPL_SCHED IPL_CLOCK #define IPL_STATCLOCK MAKEIPL(9) /* statclock */ #define IPL_HIGH MAKEIPL(9) /* everything */ #define IPL_IPI MAKEIPL(10) /* interprocessor interrupt */ /* Interrupt sharing types. */ #define IST_NONE 0 /* none */ #define IST_PULSE 1 /* pulsed */ #define IST_EDGE 2 /* edge-triggered */ #define IST_LEVEL 3 /* level-triggered */ /* * Local APIC masks. Must not conflict with SIR_* below, and must * be >= NUM_LEGACY_IRQs. Note that LIR_IPI must be first. */ #define LIR_IPI 31 #define LIR_TIMER 30 /* Soft interrupt masks. */ #define SIR_CLOCK 29 #define SIR_NET 28 #define SIR_TTY 27 /* * Maximum # of interrupt sources per CPU. 32 to fit in one word. * ioapics can theoretically produce more, but it's not likely to * happen. For multiple ioapics, things can be routed to different * CPUs. */ #define MAX_INTR_SOURCES 32 #define NUM_LEGACY_IRQS 16 /* * Low and high boundaries between which interrupt gates will * be allocated in the IDT. */ #define IDT_INTR_LOW (0x20 + NUM_LEGACY_IRQS) #define IDT_INTR_HIGH 0xef #define I386_IPI_HALT 0x00000001 #define I386_IPI_MICROSET 0x00000002 #define I386_IPI_FLUSH_FPU 0x00000004 #define I386_IPI_SYNCH_FPU 0x00000008 #define I386_IPI_TLB 0x00000010 #define I386_IPI_MTRR 0x00000020 #define I386_IPI_GDT 0x00000040 #define I386_IPI_DDB 0x00000080 /* synchronize while in ddb */ #define I386_NIPI 8 #define I386_IPI_NAMES { "halt IPI", "timeset IPI", "FPU flush IPI", \ "FPU synch IPI", "TLB shootdown IPI", \ "MTRR update IPI", "GDT update IPI", \ "DDB IPI" } #define IREENT_MAGIC 0x18041969 #endif /* _I386_INTRDEFS_H */